[rsk289]

Are you sure the seat runner is TR3? I have tried everywhere in the UK and cannot find another car with the same runners. Dan Case also advised that he was not aware of any car that used the same length. I have a pair of DB Aston ones which are the same construction, but 6" shorter.
Hawk Cars had a tool made to fold up new ones but it broke a while back. I have one new Hawk pair, and a pair of originals bought on ebay from CSX2000-series car which was raced from new. Don't ask what those runners cost me, the pain is still there.
If TR3 really do fit that would be great news, but I'd be surprised.
Roger

Edit: just found a youtube clip showing the TR runners. TR3 are completely different. Early TR4, using two separate runners, are similar but too short. Late TR4 onwards are completely different, being a single platform type.
So best bet would probably be early TR4, but using underfloor strengthening as they would not be long enough to reach between the original chassiss outriggers on an original car.